[1]
“Role of Vitamin D Supplementation on Patients of Severe COPD to Reduce Exacerbations”, Chest & Heart J. , vol. 45, no. 1, pp. 26–30, Mar. 2023, Accessed: Jun. 24, 2026. [Online]. Available: https://www.banglajol.info/index.php/CHJ/article/view/64739